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Hi,
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Get a Ferroli wireless programmable room stat. City plumbing supplies can get hold of them but you'd be looking at approx £130. Part number 30800009. No wiring involved, the receiver connects to the boiler pcb. Had same problem but now fine.

You may have a broken thermostat wire. Disconnect the wires from the thermostat and please note what colors are hooked to which terminals. Cross the R and W wires and see if your heating system turns on. If it does not, you have a broken wire or bad connection at the heating system. If it does start, you have a bad thermostat or bad connection at the thermostat.

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This is not going to be easy. Check the wiring in the wall to look for the third wire. If they did not run one, you have to run new wire to the furnace and thermostat. If they stapled that wire to the walls inside studs, then it is going to be even harder to run the new wire. Once you run that new wire then you have to locate the connection in the furnace that has the common (c) wire for the transformer. Check you tube to see if the have any how to video.

What kind of boiler are using is this boiler a on the demand electric or gas? You need low voltage wires. If you get me make and model # of off boiler i can try and find wiring diagram . Tell me a little more about you heat system to. Like baseboard heat or in floor how many zones